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. Author manuscript; available in PMC: 2008 Sep 11.
Published in final edited form as: Biochemistry. 2006 Sep 26;45(38):11401–11413. doi: 10.1021/bi060691x

Figure 2.

Figure 2

Structure of the b heme group with the nomenclature used in this work. The light and dark rectangles indicate the orientation of the proximal His70 and distal His46, respectively, in S6803 rHb-R. The ϕ and β angles characterize the geometry of the axial ligands: β is the acute angle between the two imidazole planes, and ϕ is the angle between the bisector of the two planes and the x axis. The proximal His93 in Mb is oriented along the NB–ND axis (not shown).